Hexagon socket head cap screws with low head. This product, although a high-strenght precision fastener, is recommended for lighter fastening applications. It is not suggested for use in critical high-strenght applications where socket head cap screws should normally be used. They are designed to be used in applications where head height clearance is a problem. Because of their reduced head height and smaller socket size, they normally cannot be properly preloaded as a standard socket cap screw and should not be subjected to high dynamic loads.

Dimensions in inches - source ASME B18.3 table 1G - 2008- Low head Hex Socket Cap Screws
d basic thread size		Nr of threads x inch		A max	H min	D min	T min	J hex socket
inches	mm	UNC	UNF
4 (0.1129
5 (0.125)
6 (0.138)
8 (0.164)
10 (0.19)
1/4
5/16
3/8
7/16
1/2
5/8

The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from IFI – Industrial Fastener Institute, 6363 Oak Tree Blvd Independence, OH 44131, USA.
WARNING - The datasheets provided by this site (fasten.it) are only advisory in support of the commercial activity and their use by anyone is entirely voluntary. Reliance on their contents for any purpose by anyone is at his/her sole risk and Fasten.it s.r.l./www.fasten.it is not responsible for any loss, claim or damage arising there from.

Hex and spline socket button head cap screws

Dimensions in inches - source ASME B18.3 table 3 - 2008 hex and spline socket button head cap screws
d basic thread size		Nr of threads x inch		A max	H min	L max standard	T min	J hex socket	M spline socket
inches	mm	UNC	UNF
0 (0.06)
1 (0.073)
2 (0.086)
3 (0.099)
4 (0.1129
5 (0.125)
6 (0.138)
8 (0.164)
10 (0.19)
1/4
5/16
3/8
1/2
5/8

The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from IFI – Industrial Fastener Institute, 6363 Oak Tree Blvd Independence, OH 44131, USA.
WARNING - The datasheets provided by this site (fasten.it) are only advisory in support of the commercial activity and their use by anyone is entirely voluntary. Reliance on their contents for any purpose by anyone is at his/her sole risk and Fasten.it s.r.l./www.fasten.it is not responsible for any loss, claim or damage arising there from.

Hexagon socket head cap screws. The socket head shall have a flat chamfered top surface with smooth or knurled cylindrical sides and a flat bearing surface.

Dimensions in inches - source ASME B18.3 table 1A Publication date: 2003
d basic thread size		Nr of threads x inch		dk max	k max	t min	b min	S nom	M nom
inches	mm	UNC	UNF
0	1.52	-	80	0.096	0.060	0.025	0.5	0.05	0.06
N° 1	1.85	64	72	0.118	0.073	0.031	0.62	0.062	0.072
N° 2	2.18	56	64	0.140	0.086	0.038	0.62	0.078	0.096
N° 3
N° 4
N° 5
N° 6
N° 8
N° 10
1/4
5/16
3/8
7/16
1/2
5/8
3/4
7/8
1
1 1/8
1 1/4
1 3/8
1 1/2
1 3/4
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4

Approx. mass, in kg x1000 pcs, (ρ=7,85 kg/dm3) -
d thread size	4-40	6-32	8-32	10-24	10-32	1/4	5/16	3/8	7/16	1/2	5/8	3/4
nominal length l
1/4	0,53	0,93	1,49	2,19	2,25
5/16	0,58	1,01	1,61	2,36	2,43	4,37
3/8	0,64	1,10	1,74	2,51	2,60	4,65	8,41
7/16	0,70	1,19	1,87	2,68	2,78	4,95	8,88
1/2
5/8
3/4
7/8
1
1-1/4
1-1/2
1-3/4
2
2-1/4
2-1/2
2-3/4
3
3-1/4
3-1/2
3-3/4
4
4-1/4
4-1/2
4-3/4
5
5-1/4
5-1/2
5-3/4
6
6-1/4
6-1/2
6-3/4
7

The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from IFI – Industrial Fastener Institute, 6363 Oak Tree Blvd Independence, OH 44131, USA.
WARNING - The datasheets provided by this site (fasten.it) are only advisory in support of the commercial activity and their use by anyone is entirely voluntary. Reliance on their contents for any purpose by anyone is at his/her sole risk and Fasten.it s.r.l./www.fasten.it is not responsible for any loss, claim or damage arising there from.

Socket Flat Countersunk Head Cap Screws. The flat countersunk head shall have a flat top sur-face and a conical bearing surface with included angle of approximately 82 deg.

Dimensions in inches  - ASME b18.3Table 2A - 2008- Socket Flat  Countersunk Head Cap Screws
d thread size		Nr. of threads x inch		d1 min	b basic thread length	dk max theo.Sharp	k max	t min	S nom	M nom
inches	mm	UNC	UNF
0 (0.06)	1.52	-	80	0.568	0.5	0.138	0.044	0.025	0.035	0.048
1 (0.073)
2 (0.086)
3 0.099)
4 (0.112)
5 (0.125)
6 (0.138)
8 (0.164)
10 (0.19)
1/4
5/16
3/8
7/16
1/2
5/8
3/4
7/8
1
1-1/8
1-1/4
1-3/8
1-1/2

The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from IFI – Industrial Fastener Institute, 6363 Oak Tree Blvd Independence, OH 44131, USA.
WARNING - The datasheets provided by this site (fasten.it) are only advisory in support of the commercial activity and their use by anyone is entirely voluntary. Reliance on their contents for any purpose by anyone is at his/her sole risk and Fasten.it s.r.l./www.fasten.it is not responsible for any loss, claim or damage arising there from.